Let me find a post that may give you some idea of what to expect with degradation

Okay, I found it, Follow the link to get the whole situation, But in short
TomHarkness ( The Guru ‍♂) took an xAC antenna and connected it to a Proxmark Easy, not the same, but you will see he talks about the tuning. Your case will be slightly different because you are extending for what it is tuned for… blah blah blah
Again follow the link for pictures,
anyway

Keep in mind that this antenna is not designed to work with the proxmark3, nor has it been tuned even closely to what it should be. So, when issuing a hw tune you’ll be under 10v with a long cable.

I then Wrote my xEM to an EM410x ID with that same coil to use with some equipment at home for testing, all went well… Until I had to re-write my HID ID back later that night so that I could get in to work the next day. I tried to write, nothing, nothing again, more nothing, Its still in freaking EM410x mode! Argh! WTF!

I shortened the cable between the coil and proxmark and used a lighter gauge wire in an attempt to get more power. This worked, and I was finally able to write the xEM back to HID mode. PHEW! Coil tuning matters more than anything else!

So here goes!
Below I am going to try and outline my experiences with the xEM implant and Chinese cloners in the hopes that it will help some of the community. I am no expert - just a guy that likes to fiddle in my spare time. I got my xEM implanted some months ago and after cloning my work HID card to the xEM with one of the dreaded Blue Cloners I have been on a war path even since to understand the technology properly, unlock my implant and possibly help some other people unlock their implant…

They make access panels for drywall. They’re usually installed someplace where you might need to get at the plumbing. For instance, on the outside of the wall of a shower stall, so you can get to the backside of the valve.

They come in a huge variety of sizes and styles, are designed to blend in, and are cheap and available at any home improvement store.

Nah but 4realz, 4-5 feet is alot for an antenna extension. It affects the impedance significantly. I’m not sure what exactly you’re doing here, @Steven1727. Do you want the reader to be in your attic and unlock your garage door and start your Harley in your garage in one fell swipe?

Oh hell yeah, the difference with coax cable is astronomical when you talk about rf (TBH probably not too much at this frequecey considering the joint between the different coax portions will be awful from a loss perspective)

Does this really play into effect? HDMI cables can be made of gold, doesn’t mean it will work.

High quality AV cables are a racket because the viewing/listening device itself needs to be expensive enough to process the difference in signal quality (which they seldom are) and in the end our shitty sensory organs can’t tell the difference anyway.

When you’re talking RF communication between two processors, signal quality does make a significant difference. It can be the difference between a 1 and a 0. We’re not just talking about the metal that the signal is being transmitted over (although that does play a part). There’s also the distance between the signal wire and the grounding jacket, and the dielectric properties of the material between the two, which affects the capacitance of the signal channel. Then there’s any Inductance or resistance introduced by the length of the wire and the interface between the wire and the connectors. All of these factors affect impedance, which can create signal reflections or distortions depending on frequency. The maximum length of the signal wire is also affected by the rise time of the signal.

Original question was about the Harley yes. I can make the garage work just figured if I could extend it it would look nicer being hidden in the attic with just the antenna coming down.

Here is my idea: blue circle is where the battery and fuse panel are, red circle is general area where I would like to put the antenna. On bikes most of the wires are ran down the frame under the gas tank, I was hoping I could do the same with this. But if it’s going to really hurt the performance of the antenna I can try to find another place to put it.